Adiabatic and multimode interference couplers on silicon-on-insulator

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Adiabatic and multimode interference (MMI) 3-dB couplers based on silicon-on-insulator rib waveguides were fabricated and measured. For testing purposes, pairs of identical couplers were cascaded to form Mach-Zehnder interferometers. The adiabatic couplers showed excess on-chip loss of ~0.5 dB, extinction ratio (ER) of 15-20 dB, and a wide spectral range. The MMI couplers processed on the same wafer showed similar loss per coupler, higher ER, and limited spectral characteristics.
Original languageEnglish
Pages (from-to)2287-2289
JournalIEEE Photonics Technology Letters
Issue number21
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed


  • Integrated optics
  • optical device fabrication
  • optical planar waveguide couplers
  • silicon-on-insulator (SOI) technology


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